Angle and angular displacement are dimensionless quantities. Angle is equal to arc length divided by radius.

If both assertion and reason are true and reason is the correct explanation of assertion

Angle and angular displacement are dimensionless quantities. Angle is equal to arc length divided by radius.}

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Angle and angular displacement are dimensionless q

Notes on Units and measurement

Concepts Used:

Units and Measurement

Unit:

A unit of a physical quantity is an arbitrarily chosen standard that is broadly acknowledged by the society and in terms of which other quantities of similar nature may be measured.

Measurement:

The process of measurement is basically a comparison process. To measure a physical quantity, we have to find out how many times a standard amount of that physical quantity is present in the quantity being measured. The number thus obtained is known as the magnitude and the standard chosen is called the unit of the physical quantity.

System of Units:

CGS system
FPS system
MKS system
SI units

Types of Units:

Fundamental Units -

The units defined for the fundamental quantities are called fundamental units.

Derived Units -

The units of all other physical quantities which are derived from the fundamental units are called the derived units.